It was _____ the old clock that the old man spent the whole morning at home.
| A．repair | B．repairing | C．to repair | D．in repair |
I didn’t make sense of _______poem until I read it _______ third time.
| A．the; the | B．a; the | C．the; a | D．a, a |
—He failed in the exam again.
—He __________his teacher’s advice.
| A．should not have followed | B．should not follow |
| C．mustn’t follow | D．should have followed |
When firstto the market, these products enjoy great success.
| A．introducing | B．introduced | C．introduce | D．being introduced |
It is uncertain ______ side effect the medicine will bring about, although about two thousand patients have taken it.
| A．what | B．that | C．how | D．whether |
The English in the future will be quite different from the English of today. It is possible that some English words may even ________ completely.
| A．die down | B．die out | C．die off | D．die of |